Chain grate.



J. RADEMACHER. CHAIN GRATE.

APPLICATION FILED SEPT. 19, 1911.

1,028,276o 1 Patented June 4, 1912.

' 3 SHBBTS*SHEET l.

Jnvew for:

J. RADEMAGHER.

CHAIN GRATE.

APrLIoATIoNvrILED sEPT.19, 1911.

1,028,276, Patented June 4, 1912.

3 SHEETS-SHEET 2.

Frm

COLUMBIA PLANDGAPH C0.. WASHINUTDN. D. C.

J. RADEMAGHER.

Patented June 4, 1912.

3 SHEETS-SHEET 3.

coLUMm PLANOGRAPH cr1..wAsHlNGToN, n. c

FFQFL.

JOHANN RAIDEIVIACI-'.IER,4 VOF'IIEANKOW', NEAR BERLIN,

CHAIN GRATE.

Specification of Letters Patent.

Patented June 4f, 1912.

Application filed September 19, 1911. Serial No. 650,172.

To all 1li/omit may concern.'

Be it known that I, JOHANN RADEMACHER, a subject of the German Emperor,and residing at Pankow, near Berlin, Germany, have invented certain newand useful Improvements in Chain Grates, of which the following is aspecification.

My invention relates stokers.

More particularly my invention relates to that class of chain-grates inwhich the gratebars are carried by crosspieces which vin turn arecarried by the links of the chain.

One of the objects of my invention is to provide a chain-grateof theclass described with independently and separately removable grate-barswhich are held in place and secured to the chain by suitable mechanismduring their travel on the upper and lower paths of the grateV and whilerounding` the rear grate-drum that is, during a part only of eachrevolut-ion of a link of the chain, but which are left free and unlockedfrom the chain while rounding the front gratedrum in order that they maybe removed and replaced.

to chain grate In accordance with one form of my invention I providesuitable stops or crosspiecesmounted Aon the chain-links and on the reardrum which hold the grate-bars securely in place while traveling ontheir upper and lower paths and around the rear drum. In another form,the grate-bars are rotatable relatively to the crosspieces which carrythem and are kept from dropping away from their carriers by a suitableguide while rounding the rear drum. In this species of the invention Iprefer to provide guards for the grate-bars to protect their lowersurfaces from ashes. These guards consist preferably of inclined guideplates carried by the cross-bars of the chains. In a third form thegrate-bars project beyond the links which carry them and during part oftheir path are locked by adjacent links co-acting with their projectingends.

My invention consists in the parts, improvements and combinations moreparticularly described hereinafter and pointed out in the claims.

Referring now to the drawings which are attached to this specificationand form a part thereof g-F igures l to 5 illustrate one species of theinvention, in which the gratebars are rotatably mounted on theircarriers; Figs. 6 to 9 illustrate a second species in which thegrate-bars are inserted in their carrier by sliding them onto theircarriers without rotating them, and Figs. 9 and l0 illustrate a thirdspecies comprising gratebars having specially shaped ends. In all `thespecies, the grate-bars are removed by sliding them lengthwise. Fig. lshows' a longitudinal section of my chain-grate, and

a longitudinal section, chain-links and modiiied grate-bars, Fig. at aplan View of the same when on the upper runway, and Fig. A5 alongitudinal section of the same when on the lower runway; Fig. 6 is alongitudinal section. of a simplified species of myy invention, .Fig. 7a crossseci tion of the same, Fig. 8 an enlarged longitudinal section ofthe same, and Fig..9 a top plan view of a part of the simplifiedchaingrate, comprising a modified formvof .gratebar, while on the upperrunwayyliig. l0 is a longitudinal section of another form of grateaccording to my invent-ion, and Fig. ll is a like view of the rear endand of the latter grate and appertaining clinker-removing apparatus.

Referring firstly to Figs. 6 to 9 showing the second species of theinvention, the length ofthe grate-bar in the form illustrated equals twolinks of the chain. Each `grate-bar l is mounted on suitable carrierswhose form may be widely varied. As illustrated two cross-bars 2 areused, but a single cross-bar of suitable section may be substitutedtherefor. The means for removably connecting the grate-bars to theircarriers may be widely varied. As illustrated, the gratesbars areprovided with hook-shaped projections 3 and 3a which are hooked over thecross-bars 2 (Figs. 6 and 8). In order to prevent displacement of thegrate-bars on the upper and lower runways of the grates and to secureand lock the grate-bars to their carriers, stops are provided,preferably in the form of cross-bars 4L. These stops lock the grate-barsto their carriers while on the upper and lower runways by coming intocontact with the projections on the grate-bars and thus preventlongitudinal movement of the grate-bars with relation to their carriers.These stops are preferably mounted upon those guide links of the chainwhich are unprovided with carrying cross-bars. (Fig. 6.) As thegrate-bars turn around the drum or wheel 5 at which enlarged, showingtime theym retain their position by gravity) Fig. 2 a cross-section ofthe same; Fig. 3 is' a gap is formed between adjacent gratebars, thegrate-b ars are unlocked and may be readily inserted and removed (Fig.6). Suitable means are provided for locking the grate-bars to theircarriers and for preventing the grate-bars from dropping by gravity awayfrom their carriers while rounding the rear chain-drum 6. These meansmay be varied. As illustrated, I provide stops in the form of ribs 7 onthe drum 6 (Fig. 6) which come in front of and into contact with thedownward projections 3a of thel grate-bars, after the stops L1 aredisengaged therefrom. Vhile traveling in their straight paths, thechain-links are supported by rollers 8 (Figs. 6 and 7) located in theframe 9. Straight grate-bars are readily removed and replaced whilerounding the drum 5. If grate-bars 1L having side projections whichengage adjacent bars are used (see Fig. 9), they can then be removed andreplaced singly and separately by providing a straight grate-bar 1b atthe side of the chain. After this grate-bar has been removed, the otherscan be removed one at Va time by separating them until their lateralprojections are disengaged. One of the advantages of this form of myinvention resides in the fact that the grate-bars can expand andcontract while the grate is in operation without affecting thecross-bars which carry them. Moreover, if two adjacent grates becomestuck or rusted together, they may be easily separated and independentlyremoved and replaced. Again, each grate-bar may be separately removedand replaced without its being necessary to remove the remaining bars.

Referring now to the species of my in-v vention illustrated in Figs. 1to 5, this form differs from that illustrated in the remaiir ingfigures, in that the grate-bars 1c are first hooked upon a singlecrossbar 2 as shown in dotted lines at the left in Fig. 1. Thegrate-bar'is then rotated about its carrying cross-bar until it restsupon the second cross-bar 2b. This is accomplished by giving a specialshape to the hook-like projec tions 3b and by a particular location ofthe forward crosspiece or carrier 2a. By these means, the grate-bars arefirmly held in place against lengthwise displacement on their carrierswithout the assistance of the rear crosspieces 21. The crosspiece 2b,however, holds the grate-bar when it is return ing along the lower pathof the chain and prevents it from rotating too far. This rotation ofthegrate-bar has for its object to provide a vfree supply of air to thefuel on the upper grate-bars and to prevent adjacent grate-bars fromsticking together. The grate-bars are removed and replaced when in frontof the forward drum 5. Suitable means are provided for holding thegratebars while rounding lthe rear drum. These means lnay be widelyvaried. In the form illustrated, a fixed guide wall 11 (Fig. 1) is usedfor the purpose. In order to keep the lower surface of the hanginggratesbars free from ashes, suitable means are provided, preferably inthe form of inclined guide plates 12 mounted upon the cross-bars 2b. Theshape of the grate-bar may be widely varied. The lateral lprojections ofthe modified grate-bars 1d shown in Figs.

3 to 5 are so inclined in the direction of the grate-bars that they willnot collide when the grate-bars turn. Each bar may thus be removed bysliding it in the direction of its length after turning it through therequired angle.

.In a preferred embodiment of my invention I construct the grate-bars sothat they will present an unbroken floor while traveling on their upperpath and will pass on and off the chain-drums without interference. Theends of grate-bars that proj ectl at some distance from the links whichcarry them are apt to collide with adjacent ends of grate-bars whenpassing on and off the chain-wheels. To avoid this difficulty, asclearly shown in Figs. 10 and 11 I provide the ends of the bars withrentrant angles a and coperating inclined, cutaway projections 1fl asclearly illustrated in the drawings. The projections 13 at one end ofthe grate-bar are provided with circular arcs 13fL the center of thecircle being the pivot 1a at the corresponding end of the guide linkcarrying the grate-bar. In this form each grate-bar 1c is carried by twobearers or cross-bars 2c of U-section mounted at one end on one link10a. The link 10b pivotally connected to the end of the link 10a nearestthe said projection 13 of the appertaining grate-bar is of L-shape andcarries a cross-bar t which locks the appertaining grate-bar on theupper and lower runways of the chain, but automatically unlocks itat thechain-whecls 5a and 6a. At the rear chain-wheel 6l each grate-bar islocked in turn by one of the projections 7 a, while each grate-bar canbe removed lengthwise from the chain at the front chain-wheel 5a. Owingto the center of the arc 1321 being the described pivot 14, when agrate-bar rounds the front chain-wheel the projection 13 slides smoothlyagainst it-s appertaining cross-bar #la and is locked thereby when thegrate-bar is horizontal. Fuel is supplied through the feed hopper 15. Atthe rear end of the grate is provided a scraper 1G whereby clinker orash is conveyed to the trap door 17. The length of the grate-bars mayequal that of the links or it may-be double the length (Figs. 6 to 9),or it may be increased.

Having thus described my invention, its

operation will be clear without further eX-V f k13o planation.

It will be understood thatmany changes may be made in the constructionand arrangement of the parts without' departing from the principle ofthe invention.

What I claim and desire to secure by Letters Patent is l. In achain-grate, the combination of a chain, a plurality of carriers securedto the chain, a plurality of detachable grate-bars carried by saidcarriers, and means for securing said bars to the carriers during aportion only of the travel of the chain, the grate-bars beingautomatically unlocked from the carriers during another portion of thetravel of the chain to permit removal of the bars.

2. PIn a chain-grate, the combination of a chain having a plurality oflinks, a plurality of carriers secured to the links, a plurality ofgrate-bars carried by the carriers, and means for intermittently lockingsaid grate-bars to said carriers during a portion only of the travel ofthe chain, the gratebars being intermittently unlocked from saidcarriers during another portion of the travel of the chain to permitremoval of the bars.

3. In a chain-grate having a plurality of links, a plurality of carrierssecured to said links, a plurality of removable grate-bars, securingmeans for each grate-bar .tor detachably securing said bar to itscarrier so as to permit its removal in a direction lengthwise of thebar, and means for intermittently locking said grate-bars to theircarriers during parts of' the travel of the chain, said bars beingunlocked from said carriers during other parts of their travel.

4. In a chain-grate, the combination of a link, a carrier including across-bar secured thereto, a lengthwise removable grate-bar mounted onsaid cross-bar, and means for intermittently locking said grateebar tosaid cross-bar during part only of each revolution of said link.

5. In a chain-grate, the combination of a traveling link, a cross-barsecured thereto, a removable and replaceable grate-bar mounted on saidcross-bar, one or more projections on said grate-bar for engaging saidcross-bar, and means for preventing longitudinal movement of saidgrate-bar with relation to its cross-bar during part only of eachcomplete revolution of the link.

6. In a chain-grate, the combination of a Vtraveling link, a crosswbarhaving a projecting portion secured thereto, a removable and replaceablegrate-bar mounted on said crossi bar, one or more hook-shapedprojections carried by said grate-bar for engaging the corresponding'projection on said cross-bar, and means for preventing longitudinalmovement of said grate-bar with relation to its cross-bar during partonly of each complete revolution of the link.

7. In a traveling chain-grate, the combination of a plurality of links,cross-bars mounted on said links, longitudinally removable andreplaceable grate-bars carried by said cross-bars, and stops for saidgrate bars to prevent longitudinal displacement thereof with relation tosaid chain during part only of each complete revolution ot said links.

S. In a traveling chain-grate, the combination of a plurality of links,cross-bars mounted on some of said links, removable and replaceablegrate-bars carried by said cross-bars, and stops *for said 4grate-barscarried by others of said links, which stops automatically move intoposition to prevent 'longitudinal displacement of said grate bars withrelation to said chain.

9. In a traveling chain-gate, the combination of a chain having aplurality of links, cross-bars mounted on some of said links, removableand replaceable grate-bars carried by said cross-bars, means for lockingsaid grate-bars t0 said cross-bars during the travel of said links ontheir upper and lower paths, a rear chain-wheel around which said chainpasses, and means rotating with said wheel for locking said grate-barsto said cross-bars while they are rounding the Wheel, said grate barsbeing unlocked from said cross-bars during part of the revolution of thechain.

l0. In a traveling chain-grate, the combination of a chain having aplurality of links, cross-bars mounted on some of said links, removableand replaceable grate-bars carried by said cross-bars, means for lockingsaid grate-bars to said cross-bars during the travel of said links ontheir upper and lower paths, a rear chain-wheel around which said chainpasses, and one or more stops rotating with said wheel for locking saidgrate-bars to said crosswbars while they are rounding the wheel, saidgrate bars being unlocked from said cross-bars during part of the revolution of the chain.

11. In a traveling chain-grate, the combination of a chain having aplurality of links, cross-bars mounted on some of said links, removableand replaceable grate-bars carried by said cross-bars, means for lockingsaid grate-bars to said cross-bars during the travel of said links ontheir upper and lower paths, a rear chain-wheel around which said chainpasses, and a plurality of stops carried by said wheel for locking saidgratebars to said cross-bars while they are rounding the wheel.

l2. In a traveling chain-grate, the combination of a plurality of links,a cross-bar mounted on one of said links, a removable and replaceablegrate-bar having a hook cla'sping said cross-bar, a projection on saidgrate-bar, a stop connected to an adjacent link for coacting with saidprojection and locking the grate-bar, a rear chain-wheel,

one or more stops connected to said wheel for coacting with the hook onsaid grate-bar, after the stop on the link has become disengaged fromthe said projection, so as to prevent the grate-bar from dropping awayfrom its carrier while rounding the rear chain-wheel.

13. In a traveling chain-grate, the combination of a plurality of links,cross-bars projecting from said links, a plurality of removable andreplaceable grate-bars mounted on said cross bars, the adjacent edges ofsaid grate-bars having rentrant angular portions with circularprojections that cooperate with the projecting edge of the adjacentgrate-bar so that the bars Jform an unbroken floor while on their upperpath,

and turn without interference while going on and off the chain-drums.

14. In a chain-grate, the combination of a chain, a plurality ofcarriers secured to the chain, a plurality of detachable gratebarscarried by said carriers, and means for securing said bars to thecarriers during a portion of the travel of the chain, the gratebarsbeing automatically unlocked from the carriers during another portion ofthe travel of the chain, one end of each grate-bar hav ing a rentrantangle and the other end of each grate-bar being pointed and adapted tointermittently enter into the angle in the adjacent grate-bar.

l5. In a chain-grate, the combination of a bearer, a link carrying Voneend thereof, a grate-bar hooked on the bearer, one end of the grate-barhaving a rentrant angle and a downwardly curved projection, an L- shapedlink having one arm pivoted to the former link, the center of the pivotconnecting the said links being the center of curvature of the outeredge of the said projection, a cross-bar carried by the other arm of theL-shaped link and adapted to coact with the outer edge of the saidprojection during part of the travel of the link, links connected to theL-shaped link, a bearer mounted on one of the latter links, and agrate-bar hooked on the latter bearer the latter grate-bar having apointed end adapted to intermittently enter into the rentrant angle inthe former grate-bar.

In testimony whereof, I affix my signature in the presence of twowitnesses.

JOHANN RADEMAGHER.

IVitnesses:

ARTHUR LE LEAN,

IVALDEMAR I-IAUrT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

